caret.java

源码为Eclipse开源开发平台桌面开发工具SWT的源代码,

	image = null;
	font = null;
	oldFont = null;
}

void resize () {
	resized = false;
	int hwnd = parent.handle;
	OS.DestroyCaret ();		
	int hBitmap = image != null ? image.handle : 0;
	OS.CreateCaret (hwnd, hBitmap, width, height);
	OS.SetCaretPos (x, y);
	OS.ShowCaret (hwnd);
	move ();
}

void restoreIMEFont () {
	if (!OS.IsDBLocale) return;
	if (oldFont == null) return;
	int hwnd = parent.handle;
	int hIMC = OS.ImmGetContext (hwnd);
	OS.ImmSetCompositionFont (hIMC, oldFont);
	OS.ImmReleaseContext (hwnd, hIMC);
	oldFont = null;
}

void saveIMEFont () {
	if (!OS.IsDBLocale) return;
	if (oldFont != null) return;
	int hwnd = parent.handle;
	int hIMC = OS.ImmGetContext (hwnd);
	oldFont = OS.IsUnicode ? (LOGFONT) new LOGFONTW () : new LOGFONTA ();
	if (OS.ImmGetCompositionFont (hIMC, oldFont)) oldFont = null;
	OS.ImmReleaseContext (hwnd, hIMC);
}

/**
 * Sets the receiver's size and location to the rectangular
 * area specified by the arguments. The <code>x</code> and 
 * <code>y</code> arguments are relative to the receiver's
 * parent (or its display if its parent is null).
 *
 * @param x the new x coordinate for the receiver
 * @param y the new y coordinate for the receiver
 * @param width the new width for the receiver
 * @param height the new height for the receiver
 *
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 */
public void setBounds (int x, int y, int width, int height) {
	checkWidget();
	boolean samePosition = this.x == x && this.y == y;
	boolean sameExtent = this.width == width && this.height == height;
	if (samePosition && sameExtent) return;
	this.x = x;  this.y = y;
	this.width = width;  this.height = height;
	if (sameExtent) {
		moved = true;
		if (isVisible && hasFocus ()) move ();
	} else {
		resized = true;
		if (isVisible && hasFocus ()) resize ();
	}
}

/**
 * Sets the receiver's size and location to the rectangular
 * area specified by the argument. The <code>x</code> and 
 * <code>y</code> fields of the rectangle are relative to
 * the receiver's parent (or its display if its parent is null).
 *
 * @param rect the new bounds for the receiver
 *
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 */
public void setBounds (Rectangle rect) {
	if (rect == null) error (SWT.ERROR_NULL_ARGUMENT);
	setBounds (rect.x, rect.y, rect.width, rect.height);
}

void setFocus () {
	int hwnd = parent.handle;
	int hBitmap = 0;
	if (image != null) hBitmap = image.handle;
	OS.CreateCaret (hwnd, hBitmap, width, height);
	move ();
	if (font != null) {
		int hFont = font.handle;
		saveIMEFont ();
		setIMEFont (hFont);
	}
	if (isVisible) OS.ShowCaret (hwnd);
}

/**
 * Sets the font that the receiver will use to paint textual information
 * to the font specified by the argument, or to the default font for that
 * kind of control if the argument is null.
 *
 * @param font the new font (or null)
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_INVALID_ARGUMENT - if the font has been disposed</li>
 * </ul> 
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 */
public void setFont (Font font) {
	checkWidget();
	if (font != null && font.isDisposed ()) {
		error (SWT.ERROR_INVALID_ARGUMENT);
	}
	this.font = font;
	if (isVisible && hasFocus ()) {
		int hFont = 0;
		if (font != null) hFont = font.handle;
		if (hFont == 0) hFont = defaultFont ();
		saveIMEFont ();
		setIMEFont (hFont);
	}
}

/**
 * Sets the image that the receiver will use to paint the caret
 * to the image specified by the argument, or to the default
 * which is a filled rectangle if the argument is null
 *
 * @param image the new image (or null)
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_INVALID_ARGUMENT - if the image has been disposed</li>
 * </ul> 
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 */
public void setImage (Image image) {
	checkWidget();
	if (image != null && image.isDisposed ()) {
		error (SWT.ERROR_INVALID_ARGUMENT);
	}
	this.image = image;
	if (isVisible && hasFocus ()) resize ();
}

void setIMEFont (int hFont) {
	if (!OS.IsDBLocale) return;
	LOGFONT logFont = OS.IsUnicode ? (LOGFONT) new LOGFONTW () : new LOGFONTA ();
	if (OS.GetObject (hFont, LOGFONT.sizeof, logFont) != 0) {
		int hwnd = parent.handle;
		int hIMC = OS.ImmGetContext (hwnd);
		OS.ImmSetCompositionFont (hIMC, logFont);
		OS.ImmReleaseContext (hwnd, hIMC);
	}
}

/**
 * Sets the receiver's location to the point specified by
 * the arguments which are relative to the receiver's
 * parent (or its display if its parent is null).
 *
 * @param x the new x coordinate for the receiver
 * @param y the new y coordinate for the receiver
 *
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 */
public void setLocation (int x, int y) {
	checkWidget();
	if (this.x == x && this.y == y) return;
	this.x = x;  this.y = y;
	moved = true;
	if (isVisible && hasFocus ()) move ();
}

/**
 * Sets the receiver's location to the point specified by
 * the argument which is relative to the receiver's
 * parent (or its display if its parent is null).
 *
 * @param location the new location for the receiver
 *
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 */
public void setLocation (Point location) {
	checkWidget();
	if (location == null) error (SWT.ERROR_NULL_ARGUMENT);
	setLocation (location.x, location.y);
}

/**
 * Sets the receiver's size to the point specified by the arguments.
 *
 * @param width the new width for the receiver
 * @param height the new height for the receiver
 *
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 */
public void setSize (int width, int height) {
	checkWidget();
	if (this.width == width && this.height == height) return;
	this.width = width;  this.height = height;
	resized = true;
	if (isVisible && hasFocus ()) resize ();
}

/**
 * Sets the receiver's size to the point specified by the argument.
 *
 * @param size the new extent for the receiver
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if the point is null</li>
 * </ul>
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 */
public void setSize (Point size) {
	checkWidget();
	if (size == null) error (SWT.ERROR_NULL_ARGUMENT);
	setSize (size.x, size.y);
}

/**
 * Marks the receiver as visible if the argument is <code>true</code>,
 * and marks it invisible otherwise. 
 * <p>
 * If one of the receiver's ancestors is not visible or some
 * other condition makes the receiver not visible, marking
 * it visible may not actually cause it to be displayed.
 * </p>
 *
 * @param visible the new visibility state
 *
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 */
public void setVisible (boolean visible) {
	checkWidget();
	if (visible == isVisible) return;
	isVisible = visible;
	int hwnd = parent.handle;
	if (OS.GetFocus () != hwnd) return;
	if (!isVisible) {
		OS.HideCaret (hwnd);
	} else {
		if (resized) {
			resize ();
		} else {
			if (moved) move ();
		}
		OS.ShowCaret (hwnd);
	}
}

}